rapidio: add Port-Write handling for EM

Add RapidIO Port-Write message handling in the context of Error
   Management Extensions Specification Rev.1.3.

Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Tested-by: Thomas Moll <thomas.moll@sysgo.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Li Yang <leoli@freescale.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 106 insertions, 3 deletions

diff --git a/include/linux/rio.h b/include/linux/rio.h
index 29d98997c6c8..4ec31f44f406 100644
--- a/include/linux/rio.h
+++ b/include/linux/rio.h
@@ -64,10 +64,13 @@
 #define RIO_INB_MBOX_RESOURCE   1
 #define RIO_OUTB_MBOX_RESOURCE  2
 
+#define RIO_PW_MSG_SIZE         64
+
 extern struct bus_type rio_bus_type;
 extern struct list_head rio_devices;    /* list of all devices */
 
 struct rio_mport;
+union rio_pw_msg;
 
 /**
  * struct rio_dev - RIO device info
@@ -107,11 +110,15 @@ struct rio_dev {
         u32 swpinfo;            /* Only used for switches */
         u32 src_ops;
         u32 dst_ops;
+        u32 comp_tag;
+        u32 phys_efptr;
+        u32 em_efptr;
         u64 dma_mask;
         struct rio_switch *rswitch;     /* RIO switch info */
         struct rio_driver *driver;      /* RIO driver claiming this device */
         struct device dev;      /* LDM device structure */
         struct resource riores[RIO_MAX_DEV_RESOURCES];
+        int (*pwcback) (struct rio_dev *rdev, union rio_pw_msg *msg, int step);
         u16 destid;
 };
 
@@ -211,9 +218,12 @@ struct rio_net {
  * @hopcount: Hopcount to this switch
  * @destid: Associated destid in the path
  * @route_table: Copy of switch routing table
+ * @port_ok: Status of each port (one bit per port) - OK=1 or UNINIT=0
  * @add_entry: Callback for switch-specific route add function
  * @get_entry: Callback for switch-specific route get function
  * @clr_table: Callback for switch-specific clear route table function
+ * @em_init: Callback for switch-specific error management initialization function
+ * @em_handle: Callback for switch-specific error management handler function
  */
 struct rio_switch {
         struct list_head node;
@@ -221,12 +231,15 @@ struct rio_switch {
         u16 hopcount;
         u16 destid;
         u8 *route_table;
+        u32 port_ok;
         int (*add_entry) (struct rio_mport * mport, u16 destid, u8 hopcount,
                           u16 table, u16 route_destid, u8 route_port);
         int (*get_entry) (struct rio_mport * mport, u16 destid, u8 hopcount,
                           u16 table, u16 route_destid, u8 * route_port);
         int (*clr_table) (struct rio_mport *mport, u16 destid, u8 hopcount,
                           u16 table);
+        int (*em_init) (struct rio_dev *dev);
+        int (*em_handle) (struct rio_dev *dev, u8 swport);
 };
 
 /* Low-level architecture-dependent routines */
@@ -238,6 +251,7 @@ struct rio_switch {
  * @cread: Callback to perform network read of config space.
  * @cwrite: Callback to perform network write of config space.
  * @dsend: Callback to send a doorbell message.
+ * @pwenable: Callback to enable/disable port-write message handling.
  */
 struct rio_ops {
         int (*lcread) (struct rio_mport *mport, int index, u32 offset, int len,
@@ -249,6 +263,7 @@ struct rio_ops {
         int (*cwrite) (struct rio_mport *mport, int index, u16 destid,
                         u8 hopcount, u32 offset, int len, u32 data);
         int (*dsend) (struct rio_mport *mport, int index, u16 destid, u16 data);
+        int (*pwenable) (struct rio_mport *mport, int enable);
 };
 
 #define RIO_RESOURCE_MEM        0x00000100
@@ -325,6 +340,33 @@ struct rio_route_ops {
                          u16 table);
 };
 
+/**
+ * struct rio_em_ops - Per-switch error management operations
+ * @vid: RIO vendor ID
+ * @did: RIO device ID
+ * @init_hook: Switch specific error management initialization (may be NULL)
+ * @handler_hook: Switch specific error management handler (may be NULL)
+ *
+ * Defines the operations that are necessary to initialize and handle
+ * error management events for a particular RIO switch device.
+ */
+struct rio_em_ops {
+        u16 vid, did;
+        int (*init_hook) (struct rio_dev *dev);
+        int (*handler_hook) (struct rio_dev *dev, u8 swport);
+};
+
+union rio_pw_msg {
+        struct {
+                u32 comptag;    /* Component Tag CSR */
+                u32 errdetect;  /* Port N Error Detect CSR */
+                u32 is_port;    /* Implementation specific + PortID */
+                u32 ltlerrdet;  /* LTL Error Detect CSR */
+                u32 padding[12];
+        } em;
+        u32 raw[RIO_PW_MSG_SIZE/sizeof(u32)];
+};
+
 /* Architecture and hardware-specific functions */
 extern int rio_init_mports(void);
 extern void rio_register_mport(struct rio_mport *);
diff --git a/include/linux/rio_drv.h b/include/linux/rio_drv.h
index c93a58a40033..edc55da717b3 100644
--- a/include/linux/rio_drv.h
+++ b/include/linux/rio_drv.h
@@ -413,6 +413,12 @@ void rio_release_regions(struct rio_dev *);
 int rio_request_region(struct rio_dev *, int, char *);
 void rio_release_region(struct rio_dev *, int);
 
+/* Port-Write management */
+extern int rio_request_inb_pwrite(struct rio_dev *,
+                        int (*)(struct rio_dev *, union rio_pw_msg*, int));
+extern int rio_release_inb_pwrite(struct rio_dev *);
+extern int rio_inb_pwrite_handler(union rio_pw_msg *pw_msg);
+
 /* LDM support */
 int rio_register_driver(struct rio_driver *);
 void rio_unregister_driver(struct rio_driver *);
diff --git a/include/linux/rio_regs.h b/include/linux/rio_regs.h
index 4bfb0dcfac7c..96ba2159d9fe 100644
--- a/include/linux/rio_regs.h
+++ b/include/linux/rio_regs.h
@@ -192,10 +192,14 @@
 #define RIO_EFB_PAR_EP_ID       0x0001  /* [IV] LP/LVDS EP Devices */
 #define RIO_EFB_PAR_EP_REC_ID   0x0002  /* [IV] LP/LVDS EP Recovery Devices */
 #define RIO_EFB_PAR_EP_FREE_ID  0x0003  /* [IV] LP/LVDS EP Free Devices */
+#define RIO_EFB_SER_EP_ID_V13P  0x0001  /* [VI] LP/Serial EP Devices, RapidIO Spec ver 1.3 and above */
+#define RIO_EFB_SER_EP_REC_ID_V13P      0x0002  /* [VI] LP/Serial EP Recovery Devices, RapidIO Spec ver 1.3 and above */
+#define RIO_EFB_SER_EP_FREE_ID_V13P     0x0003  /* [VI] LP/Serial EP Free Devices, RapidIO Spec ver 1.3 and above */
 #define RIO_EFB_SER_EP_ID       0x0004  /* [VI] LP/Serial EP Devices */
 #define RIO_EFB_SER_EP_REC_ID   0x0005  /* [VI] LP/Serial EP Recovery Devices */
 #define RIO_EFB_SER_EP_FREE_ID  0x0006  /* [VI] LP/Serial EP Free Devices */
 #define RIO_EFB_SER_EP_FREC_ID  0x0009  /* [VI] LP/Serial EP Free Recovery Devices */
+#define RIO_EFB_ERR_MGMNT       0x0007  /* [VIII] Error Management Extensions */
 
 /*
  * Physical 8/16 LP-LVDS
@@ -211,15 +215,66 @@
 #define RIO_PORT_MNT_HEADER             0x0000
 #define RIO_PORT_REQ_CTL_CSR            0x0020
 #define RIO_PORT_RSP_CTL_CSR            0x0024  /* 0x0001/0x0002 */
+#define RIO_PORT_LINKTO_CTL_CSR         0x0020  /* Serial */
+#define RIO_PORT_RSPTO_CTL_CSR          0x0024  /* Serial */
 #define RIO_PORT_GEN_CTL_CSR            0x003c
 #define  RIO_PORT_GEN_HOST              0x80000000
 #define  RIO_PORT_GEN_MASTER            0x40000000
 #define  RIO_PORT_GEN_DISCOVERED        0x20000000
 #define RIO_PORT_N_MNT_REQ_CSR(x)       (0x0040 + x*0x20)       /* 0x0002 */
 #define RIO_PORT_N_MNT_RSP_CSR(x)       (0x0044 + x*0x20)       /* 0x0002 */
+#define  RIO_PORT_N_MNT_RSP_RVAL        0x80000000 /* Response Valid */
+#define  RIO_PORT_N_MNT_RSP_ASTAT       0x000003e0 /* ackID Status */
+#define  RIO_PORT_N_MNT_RSP_LSTAT       0x0000001f /* Link Status */
 #define RIO_PORT_N_ACK_STS_CSR(x)       (0x0048 + x*0x20)       /* 0x0002 */
-#define RIO_PORT_N_ERR_STS_CSR(x)       (0x58 + x*0x20)
-#define PORT_N_ERR_STS_PORT_OK  0x00000002
-#define RIO_PORT_N_CTL_CSR(x)           (0x5c + x*0x20)
+#define  RIO_PORT_N_ACK_CLEAR           0x80000000
+#define  RIO_PORT_N_ACK_INBOUND         0x1f000000
+#define  RIO_PORT_N_ACK_OUTSTAND        0x00001f00
+#define  RIO_PORT_N_ACK_OUTBOUND        0x0000001f
+#define RIO_PORT_N_ERR_STS_CSR(x)       (0x0058 + x*0x20)
+#define  RIO_PORT_N_ERR_STS_PW_OUT_ES   0x00010000 /* Output Error-stopped */
+#define  RIO_PORT_N_ERR_STS_PW_INP_ES   0x00000100 /* Input Error-stopped */
+#define  RIO_PORT_N_ERR_STS_PW_PEND     0x00000010 /* Port-Write Pending */
+#define  RIO_PORT_N_ERR_STS_PORT_ERR    0x00000004
+#define  RIO_PORT_N_ERR_STS_PORT_OK     0x00000002
+#define  RIO_PORT_N_ERR_STS_PORT_UNINIT 0x00000001
+#define  RIO_PORT_N_ERR_STS_CLR_MASK    0x07120204
+#define RIO_PORT_N_CTL_CSR(x)           (0x005c + x*0x20)
+#define  RIO_PORT_N_CTL_PWIDTH          0xc0000000
+#define  RIO_PORT_N_CTL_PWIDTH_1        0x00000000
+#define  RIO_PORT_N_CTL_PWIDTH_4        0x40000000
+#define  RIO_PORT_N_CTL_LOCKOUT         0x00000002
+
+/*
+ * Error Management Extensions (RapidIO 1.3+, Part 8)
+ *
+ * Extended Features Block ID=0x0007
+ */
+
+/* General EM Registers (Common for all Ports) */
+
+#define RIO_EM_EFB_HEADER       0x000   /* Error Management Extensions Block Header */
+#define RIO_EM_LTL_ERR_DETECT   0x008   /* Logical/Transport Layer Error Detect CSR */
+#define RIO_EM_LTL_ERR_EN       0x00c   /* Logical/Transport Layer Error Enable CSR */
+#define RIO_EM_LTL_HIADDR_CAP   0x010   /* Logical/Transport Layer High Address Capture CSR */
+#define RIO_EM_LTL_ADDR_CAP     0x014   /* Logical/Transport Layer Address Capture CSR */
+#define RIO_EM_LTL_DEVID_CAP    0x018   /* Logical/Transport Layer Device ID Capture CSR */
+#define RIO_EM_LTL_CTRL_CAP     0x01c   /* Logical/Transport Layer Control Capture CSR */
+#define RIO_EM_PW_TGT_DEVID     0x028   /* Port-write Target deviceID CSR */
+#define RIO_EM_PKT_TTL          0x02c   /* Packet Time-to-live CSR */
+
+/* Per-Port EM Registers */
+
+#define RIO_EM_PN_ERR_DETECT(x) (0x040 + x*0x40) /* Port N Error Detect CSR */
+#define  REM_PED_IMPL_SPEC              0x80000000
+#define  REM_PED_LINK_TO                0x00000001
+#define RIO_EM_PN_ERRRATE_EN(x) (0x044 + x*0x40) /* Port N Error Rate Enable CSR */
+#define RIO_EM_PN_ATTRIB_CAP(x) (0x048 + x*0x40) /* Port N Attributes Capture CSR */
+#define RIO_EM_PN_PKT_CAP_0(x)  (0x04c + x*0x40) /* Port N Packet/Control Symbol Capture 0 CSR */
+#define RIO_EM_PN_PKT_CAP_1(x)  (0x050 + x*0x40) /* Port N Packet Capture 1 CSR */
+#define RIO_EM_PN_PKT_CAP_2(x)  (0x054 + x*0x40) /* Port N Packet Capture 2 CSR */
+#define RIO_EM_PN_PKT_CAP_3(x)  (0x058 + x*0x40) /* Port N Packet Capture 3 CSR */
+#define RIO_EM_PN_ERRRATE(x)    (0x068 + x*0x40) /* Port N Error Rate CSR */
+#define RIO_EM_PN_ERRRATE_TR(x) (0x06c + x*0x40) /* Port N Error Rate Threshold CSR */
 
 #endif                          /* LINUX_RIO_REGS_H */